Sewer inspection chamber with back-flow prevention valve and met

Details Sewer inspection chamber with back-flow prevention valve and met Sewer inspection chamber with back-flow prevention valve and met

1997-04-11

1998-10-27

Ferensic, Denise L.

Fluid handling

Processes

Cleaning, repairing, or assembling

137315, 1375278, 137371, F16L 5518

Patent

active

058266097

ABSTRACT:
An inspection chamber for use in sanitary sewer systems has an integral back-flow prevention valve. The valve can be installed through an access pipe with the inspection chamber in place underground. The valve does not interfere with the installation or removal of a plug in the inspection chamber during construction and inspection of the sewer system. The inspection chamber comprises a clip oriented to receive a valve member from the direction of an access port. The valve member comprises a pin connected to a flap member by a narrow bridge member. The flap member has a projecting handle member. An installation tool holds the valve member by the handle member and provides a tab which can be hammered downwardly to snap the pin into the clip thereby securing the valve member in the inspection chamber. An inspection chamber according to the invention avoids the necessity of providing a separate buried back-flow prevention valve.

REFERENCES:
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patent: 3626148 (1971-12-01), Woytowich et al.
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patent: 4391289 (1983-07-01), Adams
patent: 4605031 (1986-08-01), Grund
patent: 5469881 (1995-11-01), Phan et al.
patent: 5740830 (1998-04-01), Mankins

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